Who is Mrs. Jiff from Ruth Hall and Other Writings and what is their importance?

Mrs. Jiff was Ruth's nurse after the birth of her first child, Daisy. Mrs. Jiff is very fat. She drinks a lot of wine, eats a lot, and perspires a lot—especially when she is caught snooping in Ruth's drawers. Mrs. Jiff makes a lot of noise while she walks, because of her stiff gingham gown and new, thick shoes. She also wheezes a lot. Mrs. Jiff is more of a danger to the child than a help, and she gives Ruth no relief as she recovers from the birth. Mrs. Jiff even sleeps in the bed with Ruth and borrows Ruth's brush to comb out her hairpiece.